JPH0755717Y2 - CD player - Google Patents

Description

[Detailed Description of Device] (Industrial application field) This device relates to a CD player, and particularly, has improved an editing function.
Regarding a CD player.

(Prior Art) Many CD players are configured to record the recorded contents of a CD (compact disc) mounted in a CD player on a recording medium such as a magnetic tape also built in the CD player.

In the conventional recording / editing function from a CD to a magnetic tape, no consideration has been given to the agreement between the reproduction time (signal recording time) of the CD and the recordable time (tape length) of the magnetic tape. After the user grasps the time difference, if he / she decides that the CD playback time is shorter than the magnetic tape recordable time, he / she will record and edit it as it is. In addition, editing processing such as fade-out recording was performed.

(Problems to be solved by the invention) As described above, in the conventional CD player, when the CD playback time is longer than the recordable time of the magnetic tape, the music recorded on the CD after the position corresponding to the recordable time is recorded. Recording became impossible, and I had to set another magnetic tape again and try recording again.

If there are many songs to be recorded on another magnetic tape, that is all right, but if there are few songs or if it is re-recorded from the middle of the last song, the continuity of song playback cannot be ensured There is a problem that not only is it annoying, but it is difficult to play a song that is auditory continuous.

Therefore, the purpose of this invention is to record the CD on the magnetic tape even if the CD playback time and the recordable time on the magnetic tape do not match, especially when the former time is longer than the latter time. It is to provide a CD player that can record all of the songs.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the CD player according to the present invention has a signal processing circuit for signal processing at a processing speed based on a supplied clock frequency, and recording on a magnetic tape or the like. Comparing means for comparing the recordable time of the medium and the recording time of the CD; and when the comparison result of the comparing means indicates that the recordable time of the recording medium is longer than the recording time of the CD, the normal clock frequency is Clock signal supply means for supplying the signal processing circuit with a clock frequency corresponding to the difference when the recordable time of the recording medium is shorter than the recording time of the CD. It

(Operation) The CD player according to the present invention is used for recording a CD on a recording medium such as tape.
When recording the playback signal, if the recordable time of the recording medium is shorter than the CD play time, the CD is recorded according to the recordable time.
By variably controlling the playback pitch,
It enables effective recording of CD playback signals.

(Example) Next, this invention is demonstrated, referring drawings.

FIG. 1 is a block diagram showing an embodiment of a CD player according to the present invention.

A read RF signal read from a CD (compact disc) through an optical pickup is amplified by an RF amplifier 7 and then subjected to a known predetermined process in a signal processing circuit 8 including a PLL circuit to obtain a reproduced audio signal. .

The clock that serves as a reference for signal processing of the signal processing circuit 8 is obtained based on the clock from the oscillator 1. This clock is used during normal and editing (especially tape recording time
When the time is shorter than the CD playback time) and a different frequency is set.

That is, the clock from the oscillator 1 is supplied to the changeover switch 6
It is supplied to one input terminal T ₁ of the
The signal processing circuit 8 receives the clock from the oscillator 1 supplied to T ₁ and uses it as a reference clock.

The clock from the oscillator 1 is also supplied to the 1 / N frequency divider 2 where it is frequency-divided by 1 / N and then sent to one input terminal of the phase comparator 3. The phase comparison output from the phase comparator 3 is input to the voltage controlled oscillator (VCO) 4 to control its oscillation frequency.

The output of the voltage-controlled oscillator 4 is supplied to the other input terminal T ₂ of the changeover switch 6 and also the 1 / (N + α) frequency divider 5
Will also be supplied.

The clock divided by 1 / (N + α) by the 1 / (N + α) divider 5 is supplied to the other input terminal of the phase comparator 3 to obtain 1 / N
A phase comparison is performed with the clock from the frequency divider 2, and a phase difference signal of both clocks is sent to the voltage controlled oscillator 4 to control its oscillation frequency.

As described above, the changeover switch 6 normally operates at the input terminal T ₁
The input clock to the side (clock from the oscillator 1) is supplied to the signal processing circuit 8, and at the time of editing, the clock to the input terminal T ₂ to which the clock whose frequency division ratio is controlled is input is input to the signal processing circuit 8. Is being supplied to.

The microcomputer 9 performs overall system control of each of the above parts, receives various command signals input by operating the keys 10, and performs the above system control.
The display circuit 11 is caused to display the operation mode, control mode, etc. of the CD player. The command signal by operating the key 10 includes, for example, a command signal for arbitrarily controlling the frequency division ratio of the frequency divider 5.

The specific operation and processing of the CD player according to the present invention shown in FIG. 1 will be described below with reference to FIG.

First, it is determined whether or not the TOC (Table of Contents) of the CD has been read (step S1). If it is determined that the TOC (Table of Contents) has not been read, the process returns to step S1 again. If it is determined that the TOC is read, it is determined in step S2 whether the tape length has been input. The input of the tape length is performed by operating the key 10, for example.

If the tape length has not been input, the process returns to step S2, but if it is determined that the tape length has been input, the total time (total playback time) of the currently used disc is calculated by the TOC information ( Step S3).

When an editing (tape recording) instruction is input by operating the key 10 (determined in step S4), editing processing is performed (step S5). Here, the editing process is, for example, A of a tape.
It is to record on the side and side B separately.

As a result, the length of the tape is determined by the judgment processing in step S6 (when recording separately on the A side and the B side, the tape length
If / 2) is longer than the edited result (CD playing time), the play key is input by operating the key 10 as it is (determined in step S7), and then the play is performed (step S8).

On the other hand, if the editing result (CD playback time) is longer than the tape length, the shortage time of the tape is calculated in step S9, and the amount of the playback pitch to be edited is calculated based on this shortage time (step S10), if it is determined in step S11 that the reproduction pitch amount can be changed, the frequency division ratio of the frequency divider 5 corresponding to the change in the pitch amount is changed by α, adjusted and set, and switched to the changeover switch 6. A signal is sent and the clock supplied to the input terminal T ₂ is sent to the signal processing circuit 8.

In the subsequent processing, the play key input is determined in step S7, and the play operation is performed after the input (step S7).
S8).

As described above, according to the present invention, when the dubbing from a CD to a magnetic tape such as a cassette tape is performed, the recording time of the tape (tape length) is slightly shorter than the CD playback time, and the last song cannot be recorded. Although effective, a specific example is shown in FIG.

FIG. 3 is a diagram showing the relationship between the recording time and the reproducing time of the tape and the disk. Using tape for 60 minutes, A side 30
When recording the playback signal of 30 minutes and 30 seconds of the CD for the minute, if the playback pitch is set 2% faster by adjusting the frequency division ratio of the frequency divider 5, the playback time of the disc after changing the pitch is 29. It will be 54 seconds, and all songs can be recorded on a 30-minute tape.

(Effect of device) As described above, in the CD player according to the present invention,
If the playback time of the song recorded on the CD is longer than the recordable time of the tape that is the recording medium, the division ratio of the divider that becomes the reference clock of the signal processing circuit so that it is within the recordable time of the tape. Since the playback pitch is controlled, the last song in the CD will not be recorded, and there is no need to fade out.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the CD player according to the present invention, FIG. 2 is a flow chart showing the operation and processing procedure of the embodiment shown in FIG. 1, and FIG. 3 is obtained by the present invention. It is a figure which shows an effect concretely. 1 ... Oscillator, 2 ... 1 / N divider, 3 ... Phase comparator, 4 ... Voltage oscillator (VCO), 5 ... 1 / (N + α) divider, 6 ... Changeover switch, 7 ... RF amplifier, 8 ... Signal processing circuit, 9 ... Microcomputer, 10 ... Key, 11 ... Display circuit.

Claims (1)

[Scope of utility model registration request] 1. A signal processing circuit for signal processing at a processing speed based on a supplied clock frequency, and a comparison means for comparing the recordable time of a recording medium such as a magnetic tape with the recording time of a CD. If the comparison result of the comparison means indicates that the recordable time of the recording medium is longer than the recordable time of the CD, the clock frequency of the normal time is supplied to the signal processing circuit, and the recordable time of the recording medium is recorded by the CD. A CD player comprising: a clock signal supply means for supplying a clock frequency corresponding to the difference to the signal processing circuit when the time is shorter than the time.